package com.collection.treesets;

import java.util.SortedSet;
import java.util.TreeSet;

public class GetHeadSetFromTreeSetExample {
	 public static void main(String[] args) {
		 
		    //create TreeSet object
		    TreeSet tSet = new TreeSet();
		   
		    //add elements to TreeSet
		    tSet.add("1");
		    tSet.add("3");
		    tSet.add("2");
		    tSet.add("5");
		    tSet.add("4");
		 
		    /*
		      To get a Head Set from Java TreeSet use,
		      SortedSet headSet(Object fromElement) method of Java TreeSet class.
		     
		      This method returns the portion of TreeSet containing elements less than
		      fromElement.
		 
		      Please note that, the SortedSet returned by this method is backed by
		      the original TreeSet. So any changes made to SortedSet will be
		      reflected back to original TreeSet.
		    */
		   
		    SortedSet sortedSet = tSet.headSet("3");
		   
		    System.out.println("Head Set Contains : " + sortedSet);
		   
		  }
}
